Magnesium Chloride Is Often Used to Melt Ice on Sidewalks

Multiple Choice

Magnesium chloride is often used to melt ice on sidewalks. Considering that the solubility of magnesium chloride (95.21 g/mol) in water is 54.3 g per 100.0 g of water, what is the lowest temperature that you would expect to be able to melt ice with magnesium chloride? Assume ideal behavior. K_f (water)  1.86C/m

A) (40C)
B) (32C)
C) (11C)
D) (25C)
E) (22C)